Prospects always appreciate an opportunity to “see us in action”
and judge for themselves. In turn, past participants often enjoy
a reminder. While nothing beats attending a live session of ours,
webcasts and video recordings might well be the next best thing.
Below are links to several such webcasts and videos recordings
you might find useful, including two full-fledged online courses.

Unit 4 of English communication for scientists
on nature.com
shows several video examples of effective oral presentations,
including a six-minute presentation without slides by Jean-luc
on “What you should know about TeX”. (This video exemplifies
the first exercise we typically ask of training participants, too.)